A leak down test is performed with the engine not cranking. A compression test is a dynamic test engine moving a cylinder leakdown test is a static test engine at rest.
How To Do A Diy Two Stroke Leak Down Test Diy Moto Fix
Outboard leak down test. The second gauge will show you how much pressure has been lost. Performing a leak down test on an outboard marine engine duration. The leakdown gauge is hooked up to the compressed. The gauge measures the amount of air getting past the rings valves or other passages and provides a reading compared with zero leakage. So far it is looking like there is a burnt out exhaust valve on cylinder one and maybe two but well find. In this video i show how to perform a leak down test on the yamaha 50hp outboard motor.
In a cylinder leak down test the engine is placed on tdc of the cylinder in question. One gauge will tell you the pressure of the air compressing the cylinder. If the compression is low in a cylinder its time to find out why. To perform a leak down test you would pressurize the cylinder with compressed air. There are two basic ways to compression test an outboard. The spark plug is removed.
Dangar marine 24480 views. So the compression test measures how much pressure the engine can produce while cranking. In contrast to the cylinder leak down test which measures how much pressure is lost in the engine. Performing a leak down test on the yamaha 50hp outboard motor. The first is called a leak down test. Use the leak down test to know if you should be changing head gaskets valves piston rings or looking for a crack.
The internal fuel tank and cover plate are removed to expose t he flywheel. Fuel additive first the engine should be warmed to operating temperature providing it still runs. This uses a special set of gauges. Simply put each piston is placed at top dead center and the cylinder is pressurized through the spark plug hole with the leak down tester. Heres a step by step breakdown of the test.
Gallery of Outboard Leak Down Test
